Assume cover or valve is always "running" in google assistant when the state is assumed or the position is reported to allow it to be be stopped

[jbouwh]

Proposed change

Google assistant allows to stop or toggle a cover using the start/stop trait.
In case a cover or valve reports position, or when the state is assumed, the cover or valve state will not alway be closing or opening. In that case we do not know the current state till it is reported again.

This PR will change the behavior for the start/stop trait introduced with #106139 for entities that report a state or have an assumed state. For these these entities only the Stop button will show, as we assume the valve or cover is running, be cause we always want to to expose the Stop function in these cases.

If have seen this causes an issue when trying to stop a Zwave cover that reports position.

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